Yaesu Azimuth Clamp

I have had trouble holding position with the Yaesu 5400 cast azimuth clamps.
I am thinking of drilling a 1/4 inch hole through the center of the clamps
and my aluminum mast (2"od and 0.25"wall) and putting a stainless bolt
through. I suppose this somewhat weakens the casting and would have to be
careful not to tighten the bolt too much as I think there is a gap between
the casting and the pipe at that point.
Has anyone done this or do you have any advice?
thanks, ron w8gus
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